Can adults wear braces? Your general dentist can help you determine if orthodontic treatment is the right The average adult wears braces for 18 months to. Orthodontic Care FAQs. Not all dental benefits and dental insurance plans include orthodontic coverage. I began orthodontic care under another dental plan. Learn how Humana dental insurance plans offer discounts on adult and child orthodontic care, depending on the plan you choose. Get a quote today.